1.

Three circle C1, C2 and C3 with radii r1, r2 and r3 (where r1 < r2 < r3) are placed as shown in the given figure. What is the value of r2?

A. √(r1r3)
B. (r1 + r3)/2
C. (2r1r2) / (r1 + r2)
D. √(r1 + r3)
Answer» B. (r1 + r3)/2


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